Zig-zag folding shutter



FIG. 1 is a front elevational view of a zig-zag folding shutter showingour new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is an enlarged fragmentary cross-sectional view of the centralarea of a zig-zag folding shutter taken along line 3--3 of FIG. 1; and,

FIG. 4 is an enlarged perspective view of a central portion thereof.

The ornamental design for a zig-zag folding shutter, as shown anddescribed.